Rotavirus vaccines performance: dynamic interdependence of host, pathogen and environment

Area of Science:

• Pediatric Infectious Diseases
• Vaccinology
• Global Health

Background:

• Rotavirus vaccination programs have improved child health globally.
• Rotavirus vaccines demonstrate reduced efficacy in resource-limited regions of Africa and Asia.
• Low vaccine coverage and modest vaccine effectiveness hinder impact in vulnerable populations.

Purpose of the Study:

• To review factors influencing rotavirus vaccine performance in resource-limited settings.
• To identify host, pathogen, and environmental determinants of diminished vaccine efficacy.
• To propose strategies for improving rotavirus disease control.

Main Methods:

• Literature review of factors affecting rotavirus vaccine performance.
• Analysis of host-related factors: malnutrition, maternal antibodies, genetics, blood group, OPV co-administration.
• Examination of pathogen-related factors: force of infection, strain diversity, coinfections.
• Assessment of environmental factors: human microbiome.

Main Results:

• Host factors like malnutrition and maternally derived antibodies can impact vaccine response.
• Rotavirus pathogen characteristics, including strain diversity and coinfections, play a role.
• Environmental factors, particularly the human microbiome, are implicated in reduced vaccine effectiveness.
• Complex interactions between host, pathogen, and environment contribute to diminished vaccine performance.

Conclusions:

• Addressing fundamental limitations to rotavirus vaccine efficacy requires long-term solutions.
• Immediate strategy: Increase immunization coverage to achieve herd immunity and reduce disease burden.
• Enhanced vaccine strategies are needed for resource-limited settings.